**Core Concept:**
The question is about a child with a history of high fever, seizures, and subsequent rash. We are looking for the most probable diagnosis based on these clinical findings. The correct answer involves recognizing a specific disease entity known as "Kawasaki Disease."

**Why the Correct Answer is Right:**
Kawasaki Disease (KD) is a systemic vasculitis affecting infants and young children. It typically presents with high fever lasting ≥5 days, which may be accompanied by symptoms like polymorphous exanthem (non-specific skin rash), conjunctivitis, oropharyngeal inflammation (strawberry tongue), cervical lymphadenopathy, and peripheral extremity changes (red, swollen hands and feet). In this scenario, the child develops a rash on the trunk after the fever subsides, which aligns with the clinical features of KD.

**Why Each Wrong Option is Incorrect:**
A) Option A (fever lasting ≥5 days with other features) is partially correct but does not mention the post-fever rash, which is a defining feature of KD.
B) Option B (fever with other features) is too broad and does not address the post-fever rash.
C) Option D (fever with other features) is similar to Option B but lacks the post-fever rash feature.

**Why the Correct Answer is Right:**
The correct answer (Option C) takes into account the child's history of high fever along with the other typical features of KD (polymorphous exanthem, conjunctivitis, oropharyngeal inflammation, cervical lymphadenopathy, and peripheral extremity changes), as well as the post-fever rash on the trunk.

**Clinical Pearl:**
Kawasaki Disease is an important diagnosis to consider in young children with unexplained high fever and characteristic symptoms. Prompt diagnosis and treatment with aspirin and intravenous immunoglobulin can prevent coronary artery complications and reduce morbidity and mortality.

**Correct Answer:** Kawasaki Disease (Option C) is the most probable diagnosis in this scenario due to the child's history of high fever with other typical features of KD and the post-fever rash on the trunk.